$\ln\left(x-1\right)+\ln\left(x^2+1\right)$
$\lim_{x\to1}\left(\frac{4^x-3^x-1}{x-1}\right)$
$\left(6r^{\frac{7}{4}}\right)^2$
$-6-\left(-27\right)+12$
$x^2+18x+162$
$x^5y^2+\sqrt{5xy^2}+\sqrt{3}$
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